Pattern-lathe.



E. A. EASTMAN.

PATTERN LATHE.

APPLICATION FILED OCT. 23. 1913' 1,241,838. Patented 0011.2,1917.

3 SHEET$SHEET l.

E. A. EASTMAN.

PATTERN LATHE.

APPLICATION FILED OCT. 23. 1913. 1,241,838. Patented 001;. 2,1917.

3 SHEETSSHEET 2.

E. A. EASTMAN.

PATTERN LATHE. APPLICATION FILED OCT. 23. 1913.

Patented Oct. 2, 1917.

3 SHEETSSHEET 3.

30 4 r they are beyond the capability of theordi- STATES PATENT OFFICE.

ERNEST A. EASTMAN, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO THECRAWFORD, MoG-REGOR AND CANBY (30., OF DAYTON, OHIO, A CORPORATION OFOHIO.

1 PATTERN-LATHE.

To all whom it may concern:

Be it known that I, ERNEST A. EASTMAN, citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Pattern-Lathes, ofwhichthe following is a specification.

My invention relates to wood Working machines, and particularly topattern or copying lathes for turning irregular shapes. The machineherein described is especially adapted for turning shoe lasts, heads forgolf sticks, gun stocks .and other articles of similar nonsymmetricalform, and is an amplification and improvement of the construction setforth and described-in my copending application for Letters Patent,Serial- No. 755,667, filed March 20, 1913.

The object of the invention is to simplify the structure as well as themeans and mode of operation of such machine, whereby they will not onlybe cheapened in construction, but will be more eflicient in use,automatic in action, easily and quickly adjusted and unlikely to get outof repair.

Shoe lasts of the extreme shape necessary to meet the requirements ofmanufacturers of shoes of the present styles termed in the trade as thincomb lasts, have the curvature at each side of the last so pronounoed,that

nary last turning machine to produce.

One of the primary objects of the inven tion is to provide a machine bywhich lasts 01' other ,articles embodying such extreme shapes may beautomatically turned wlth great accuracy at a single operation. Tothisfend there is employed in the present construction two cutter headsactingin parallel successiveplanes, the primary head being ofcomparatively large size and strength and adapted to turn thorough blockor stock into a general semblance ofthe finished product withouthowever, %"fving the exact or finished shape thereto. he second cutterhead being of sufliciently small size to enter and follow the lines ofthe extreme curvatures is adapted to reduce the stock to its ultimate orfinished shape. Inasmuch as both cutter heads are controlled by a singlemaster or pattern wheel. it is necessary that the paths of operation ofthe two heads shall be closely adjacent. In actual operation the path ofthe primary head merges into that of the second head. In theSpecification of Letters Patent. Patented Oct, 2, 1917, Applicationfiled October 23, 1913. Serial No. 796,95].

extreme cases the change of shape many times is so abrupt that even withsuch conone cutter head may be adjusted to and from the work independentof the other. The cutter heads as herein shown and described are,further adjustable independently to different horizontal planes, wherebythe center of operation of one cutter may be above or below that of theother. -To further facilitate the turning operation and to avoid abruptvariations of the longitudinal alinement of the work, it has been founddesirable to change the general axis upon which the last is turned bythe use of an offset dog as is hereinafter described. With the aboveprimary and other incidental objects in view as will more fully appearin the specification, the invention consists of the featuresof'construction, the parts and combinations thereof and the mode ofoperationor their e uivalents as hereinafter described and in theclaims.

Referring to the drawings, Figure 1 is a front elevation of a pattern orcopying lathe, in which the invention is embodied. Fig. 2 is a detailplan view of the cutter head carriage. Fig. 3 is a rear elevationthereof. Fig. 4 is a side elevation thereof showing the drivingconnections of the variable cutter heads. Fig. 5 is a detail view of alast showing the offset axis of the rotation as compared with the axisordinarily employed. 4

Like parts are indicated by similar characters of reference throughoutthe several views. a

While the present invention relates pri* marily to the cutter heads intheir relation one with the other, together with their drivingconnections, in order to illustrate the application of the invention andits relation to other portions of the apparatus and the method ofoperation, there has been shown set'orth.

50 a of at greater pr less distances from theaxis,

. which project upright standards v3 conneted one. with the other andsuitably braced to form a ,rigid, main frame.

Pivotally supported? upon forward extending arms 4, carried by theupright standards 3, isa swinging frame compr1s-, ing pendent arms 5connected by transverse bars 6 and suitably braced into a 'rigidstructure, which is free to oscillate forward and rearward about its-pivotal connections 7. p

Carried upon suitable trunnions, journaled in bearing bars .8, is .therevoluble master form 9.' The drive trunnion of the master form carriesa gear pinion 10, meshing witha corresponding pinion/11, upon a countershaft 12. This counter shaft '12 carries a second pinion 13'meshing w1th,a corresponding pinion 14, upon the drive spindle .or trunnion 15, withwhich is J engaged the last block or other work 16- to beoperated upon.The counter shaft 12 carries at its extremity a pulley 17,'connectedby abelt 18 with a counter shaft 19,

operatively connected through sundry belts "and countershafts with themain drive shaft '20 journaled in the lower part of the main frame. Bythe rotation of the main drive, shaft 20, the counter shaft 12 isrotated to;

revolve the master form 9 and the work 16 unison. -This revolublemovement of the master form and work continues at a uniform rate,regardless of the oscillatory movement of the swinging frame.

Slidingly mounted to reciprocate .upon the bed '1, is a traveling.carriage-*"21', carrying a master or guide wheel. 22, engaging themasterform 9, and a second traveling carriage 23, carrying the cutter heads,which form the subject matter hereof and which operate upon the work 16,journaled in the swinging frame and rotated by the countershaft 12.-These traveling carriages 21 and 23 move in unison under the influenceof feed devlces.

The swinging frame at all times tends to move inward which movement isarrested by the engagement of the master form 9 with the guide or masterwheel 22. As the master'form 9 is rotated, the-portions therebroughtinto engagement with the master or guide wheel, causes the. swingingframe every portion of the block or rough stock,

whereby there is produced a finished prod matinee not which is thecounter part of the master,

form 9. This is the usual construction and operation of turning machinesof this type,

invention.

d in itself formsno part of the presentto Journaled in suitable uprights24 carried by the carriage 23 is a revoluble shaft 25 arranged at aninclination to the axis of the work and to the path of travel of thecarriage 23, carrying at one end a cutter head 26. a This cutter headmay be of any suitable shape or construction. In the drawings it hasbeen shown in the form of two curved loop shaped blades. *It mayhowever, be provided with aplurality of flat cutting blades tangentiallyarranged. The cutter heads per 86 form nopart of the present invention.jSlidingly mounted in, suit-.

able guides or ways 27in the uprights or standards 24 is a verticallyadjustable frame 28, having formed'therein horizontal guides or ways 29.Slidingly mounted in the ways or guides 29 of the adjustable frame28,'is a horizontally movable frame ,30 in which is journaled a secondshaft 31, carrying at its extremity a second cutter head 32 of Y greaterdiameter than'the cutter head 26 operating in a plane parallel with thecutter head 26 but slightly in advance thereof. This cutter head 31 isthe roughing cutter and serves to remove the greater portion of thestock preparatory to the finishing cut made by the first mentionedcutter head 26. The frame 30 is adjustable horizontally in the guides.or ways 29 of the frame 28 to vary the relation of the shafts 25 and 31to and from each other by cans of an adjusting screw 33 carried b theframe 30 and engagin the transverse bar 34 of the vertically ad ustableframe 28. An adjusting screw 35 supported in a transverse bar 36 of thecarriage 23 andengaging a transverse bar 37 of the adjustable frame 28is employed to adjust said frame 28 vertically in the guides 27 carryingwith it the frame 30 and shaft 31 with 1ts'.cutter, head 32,. therebyvarying the relative horizontal planes of the cutter heads. It is to benoted that the shafts 25 and 31 are both arranged at an inclinationtotheaxis of rotation of the work and to the. path of. travel of the,carriage 23, and are preferably though not necessarily arrangedparallel one with the other. If found desirable to meet the 'peculiarconditions of operation, the shafts may be arrangedsat difi'erentdegrees of inclination with the axis of rotation of vthe work or one ofthe shafts may besubstane tially parallel therewith while the othershaft may be incliped. Such variations being very obvious will not needillustration.

The finishing head and roughing cutter head are rotated at diflerentrates of speed. I

The relative rates of speed will depend somewhat upon the relativeproportions of the cutter heads. With the cutter heads of approximatelythe proportions shown in the drawings it has been found most desirableto rotate the roughing cutter head at a rate of approximatel per minute,whi e the finishing cutter head rotates at an approximate speed of tenthousand revolutions per minute.

To maintain an operating driving connection by which the cutter headswill be rotated at a constant'rate of speed throughout the longitudinalmovement of the traveling shaft 31. On account of the carriage 23, thereis provided upon the drive shaft 20 a drum 38 over which passes a belt39 driving a pulley 40 upon the cutter head great difference in thediameters of the driving drum 38 and .the driven pulley 40, idler ulleysnot shown in the drawing, are provi ed upon the carriage 23 to changethe direction of the travel of the belt to insure a driving contactbetween the belt 39 and the pulley 40 throughout a suflicient portion ofthe periphery thereof. At its extremity opposite the cutter head 32, theshaft 31 carries a second pulley 41. The shaft 25 carries at thecorresponding end a pulley 42 and a hand wheel 43. J ournaled upon anadjustable trunnion 44, slidingly mounted in a slot or guideway 45 inthe upright or standard 24 is an idle pul- 1ey,46. This idler pulley isvertically adjustable in its guideway by means of an ad j usting screw47 J ournaled upon a trunnion projecting from a suitable bracket 48,carried by the carriage 23, is an additional pulley 49. A driving beltshown by dotted-lines in Fig. 4, passes over the pulley 41 of the shaft31, thence under the idler pulley 46 and over the pulley 42 of the shaft25, thence under the idler pulley 49 and back to the initial pulley 41.This serves to drive the shaft 25 in unison with the shaft 31. Theadjusting screw 47 is employed to adjust the pulley 46 to compensate forany variation in the tension of the belt 50 due to the adjustment of theshaft 31 and the pulley 41 e1ther vertically or horizontally by means ofthe adjusting screws 33 or 35.

. vance of the p p duces the approximate form to the shape By theconstructlon herein described the roughing cutter head removes thesurplus stock to an ap roximate form sligihtl in adishing cutter hea ,wich recorresponding'exactly with the master form. The two cutter headsoperate inplanes closely adjacent one to the other, but are capable ofadjustment to and from each other, whereby the roughing cutter head maybe made to cut to a greater or less distance beyond the center line ofthe finishing cutter head or the shafts may be relatively variedvertically to cause one cutter to operate at a higher or lower levelthan' the other and therefore in advance of or behind the other upon theperiphery of the work.

six thousand revolutions jacent planes, and means for relativel cutterto out beyond the finish line of the product, it is desirable to offsetthe last or change its axis of rotation as shown in Figs. 1 and 5.Referring particularly to Fig. 5 the dotted line 00 w represents theaxis of rotation as ordinarily used and which would be commonly usedwhen the roughing and finishing operations are performed separately orupon separate machines. However, to permit the high comb type of last tobe automatically turned at a single operation, there has been providedan offset dog 51 to support the heel of the last in an offset oreccentric position, whereby the axis of rotation is changed from theline a: w to the line g y. The toe center 52 is retained in the sameposition, but the heel center is shifted upward adjacent to the upperedge of the last thereby causing the comb to be lowered that its outlinewill be inclined at a less obtuse angle with the axis of rotation. Thisobviates any danger of the comb being damaged by a too deep cut of theroughing cutter. It is to be understood that both the pattern or modellast and the work are provided with similar ofi'set dogs 51.

From the above description it will be apparent that there is thusprovided a device of the character described, possessing the particularfeatures of advantage before enu-.

merated as desirable but which obviously is susceptible of modificationin its form, proportion, detail construction or arrangement of parts,without departing from the principle involved or sacrificing any of itsadvantages. I

While in order to comply with the statute, the invention has beendescribed in language more or less specific as to certain structuralfeatures, it is to be understood that the invention is not limited toany specific details, but that the means and construction hereindescribed comprise but one mode of putting the invention into efiect,and the invention is therefore claimed broadly in any of its possibleforms or modifications within the scope of the appended claims.

Having thus described my invention, I claim;

1. In a machine of the character described, a support for the work to beoperated upon, two revoluble cutter heads eccentrically mounted toengage the work in parallel a3- a justing the heads, whereby one of saideads may be made to operate a greater or less distance across the centerline of the other head.

2. In a machine of the character described, a support for the work, tworevoluble cutter heads arranged side by side with one of the headsoverlapping the other, and means for "relatively adjusting the heads tovary the degree of overlap.

3'. A combination with two rotary cutters, a support laterally movableto and from the rotary cutters in which the WQI'klS revolubly mounted,and a control device regulating the depth ofoperation of t e cutters, ofa movable primary support f r one of the rotary cutters, a movableauxiliary support upon which the primary support is movable, a travelingcarriage upon which the second rotary cutter is mounted and upon whichthe auxiliary support is movable in a direction angular in relation.with the direction of movement ofthe prlmary Jsupport, said travelingcarriage being movable in a direc- 'tion angular to the direction ofmovement of both the said supports and means for rota'ting the cuttersin all positions of adjustment. a

4. In a pattern lathe, means for rotating I the work, a roughing cutterand a finishing menace work, said butters being of difierent diameterswhereby the larger cutter will project beyond the center line of thesmall cutter and means to adjust the cuttersin their planes of rotationin relation one with the other; 7 6. In a machine of the characterdescribed, a support for the work to be operated upon, two revolublecutter heads operating simultaneousl upon 'a single iece of work, a

master e ement common to 0th cutter heads,

said'cutter heads being normally variable in unison in relation with thework, nd means for adjusting one of the cutter heads tangentially to adiflerent plane in relation I with the work independent of the otheroutterhead. I a

7; In a machine of the character described, a support for the Work to beoperated upon, two revoluble cutter heads simultaneously engaging asingle piece of work, a master element common to both cutter heads, the;

relative variation of the work and cutter heads being normally common toboth cutter heads and means for adjusting one of the cutter heads bothvertically and laterally independent of the other'cutter head,

In testimony whereof, I have hereunto set my hand this 10th day ofOctober 1913.

ERNEST A. EAST a Witnesses:

HARRY F. NOLAN, Bess CnoAsMUN.

